Work holder



March 19, 1940. F. E. JOHNSON 2,194,089

WORK HOLDER Filed Nov. 16, 1958 INVENTOR.

/' I Floyd E.J0hnson' 3O BY 9 I Patented Mar. 19, 1940 UNITED STATESWORK HOLDER Floyd E. Johnson, Crystal Lake, Ill.

Application November 16, 1938, Serial No. 240,700

8 Claims.

While the present invention may be of general application, it; isdesigned primarily for holding a blank during the cutting, forming andgrinding thereof into a polyangular die punch.

Punches, as is well known, have heretofore been cut, formed and machinedby successive settings of the blank in the holding fixture cooperatingtherewith. Unless the fixture had more than one plan face, it wasnecessary to re-set the blank for each face worked on. This has resultedin a laborious process.

The present invention is designed to permit cutting, forming andmachining of all faces while retaining the original setting of theblank. In other words, the present invention contemplates a singlesetting holder or fixture for working on all faces of a punch blank, andeliminates the necessity for repeated settings.

With the above and other objects in view, as will be apparent, thisinvention consists in the construction, combination and arrangement ofparts all as hereinafter more fully described, claimed and illustratedin the accompanying drawing, wherein:

Fig. 1 is an end view of a holder embodying the features, of thisinvention, and showing the head of a punch blank in operative positionrelative thereto..

Fig. 2 is a side view, partly in section and broken. away to. illustratethe use of a recess intermediate the ends of the holder providing accessfor grinding a portion of the head of the punch blank at a predeterminedselected angular relationship to the sides of the punch.

Fig. 3 is a top plan View, with certain additions to illustrate the useof' an auxiliary clamping block to hold a rod which is adjusted at thebeginning of a job to establish the length of a series of punches andmaintain uniformity of length based on the initially set punch.

. Figs. 4, 5 and 6 are various views of a drill fixture clamping elementadapted for use in connection with the present holder.

The holder contemplated in this invention and as shown in theaccompanying drawing comprises a body of suitable metal having faces I0,I I, l2, l3, l4 and i5 defining a rectangular prism. The faces I 6 andI! at the bottom of a slot l8 cut inwardly or downwardly from the topface iii of the holder define a V-groove coextensive with the length ofthe holder and present cooperating surfaces for receiving and supportingthe shank of a punch blank in true parallel relation to the sides I0, Hand I3 and top of the holder, and in true perpendicular relation to thesides [2 and M of the holder. By

means of relatively deep slot l9 intersecting the slot l8 centrally ofthe fixture, a space or recess is provided intermediate the faces l2 andi4 perpendicular to the axis of the tool shank for accommodating thehead of the punch and rendering a face thereof accessible toa grindingdevice.

The shank of the tool or punch, designated as 2il, is adapted to be heldin position in the slot l8 by means of a socket screw 2| or the like,arranged within the body of a clamping block 22. The clamping block 22has a tongue and slot connection with the walls of the slot 18, as at 23and 24, which permits relative sliding movement of the block forpurposes of easy withdrawal or adjustment, if desired. The faces 25 and26 of the clamping block 22, which it will be observed are those facescontiguous to the top face [5 and upright face l3 of the holder, arepreferably coplanar or slightlyinward of the holder faces so as topermit use of all holder faces as machine bed bearing faces ascontemplated by this invention.

As shown in Fig. 3, a clamping block 2211 corresponding with butauxiliary to the clamping block 22, may be utilized in connection withthe present holder for the purpose, for example, of holding a rod orblank whichis adjusted at the beginning of an operation. in accordancewith a selected predetermined length. In this manner, a uniform lengthmay be maintainedin cutting, forming and machining a series of punchblanks, with maximum accuracy and minimum effort.

The clearance provided in proximity to the head of a punch blank bymeans of the recess extending transversely of the block and intermediatethe faces l2 and M of the block, provides ready access to this portionof the blank for the purpose, for example, of grinding a locking flat onthe head at a selected predetermined angular relationship to the sidesof the punch blank.

Figs. 4, 5 and 6 show a clamping block of 5 slightly modified form. Inthis construction, the clamping block is adapted to span theintersection of the slots I8 and I9 and is coextensive with the lengthof the slot 18. The position of the clamping block 30 in overhangingrelation to the intersection of said slots l8 and I9 is preferablyprovided with a jig bushing 3| to allow for guiding a drill or the likein true perpendicular relation to the axis of the work held in theholder. An opening 32 is provided in the underside of the holder, invertical alignment with said jig bushing to provide clearance for adrill or the like as it is passed through the work held in the holder.

From the foregoing it will be apparent that the present holder providesa device for supporting a punch or the like which utilizes clampingmeans that will permit the use of any side of the holder as amachine-bead bearing face, thereby eliminating the necessity forre-setting the punch or work at any interval of its machining process.Furthermore, it provides means for grinding the inner end of the punchconfined within the limits of the outer faces of the holder.

While the holder and clamping elements shown and described hereinpresent the best embodiment of my invention, it will be evident that thesame may be modified in many particulars without departing from thescope or spirit of this invention. As an example of a modificationwithin the scope of this invention, it will be obvious that a holderhaving faces defining other than rectangular shapes may be developedwithout affecting the eificiency of the holder.

What is claimed is:

l. A holder for grinding punch blanks and the like comprising a body ofpolyangular form, clamping means whose external limits permit the use ofany face of the holder as a machine bed bearing face, and means throughwhich uniform length in a series of punch blanks may be maintained inaccordance with selected predetermined lengths of an initially heldblank including a clearance slot intermediate the faces of the holderperpendicular to the axis of the blank.

2. A- punch grinding holder comprising a block of rectangular prismaticform, means adapted to centralize the shank of a punch thereincomprising a V-shaped slot cut lengthwise of the fixture, clamping meansfor locking the shank of a punch in said slot including a clamping blockhaving tongue and slot connections with the sides of said slot, andmeans for rendering a portion of the blank disposed internally of theouter limits of the holder accessible to a working operation comprisinga transverse slot intersecting said V-slot.

3. A punch grinding holder comprising a block of rectangular prismaticform, means adapted to centralize the shank of a punch thereincomprising a V-shaped slot cut lengthwise of the holder, clamping meansfor locking the shank of a punch in said slot including a clamping blockhaving tongue and slot connections with the sides of said slot, andmeans for rendering a portion of the blank disposed internally of theouter limits of the holder accessible to a working operation comprisinga transverse slot intersecting said V-slot centrally of the length ofthe fixture.

4. A punch grinding holder comprising a block of rectangular prismaticform, relatively deep slots intersecting centrally of the top face ofsaid block, the faces of the bottom of one of said slots being adaptedto receive and position a punch shank in central longitudinal andtransverse relation to the outer faces of said block, and clamping meanscooperating with the walls of said slot and having its external limitsin nonprotruding relation to the faces of said holder.

5. A punch grinding holder comprising a body of polyangular form,relatively deep slots intersecting centrally of and extending inwardlyfrom a selected face of said block, the faces of the bottom of one ofsaid slots being adapted to receive and position a punch shank incentral longitudinal and transverse relation to the outer faces of saidblock, clamping means cooperating with the walls of said slot and havingits external limits in non-protruding relation to the faces of saidholder, and means in overhanging relation to the intersection of saidslots for guiding a drill or the like through the punch and in trueperpendicular relation to the longitudinal axis of said punch.

6. A holder for grinding punch blanks and the like comprising a body ofpolyangular form, clamping means whose external limits permit the use ofany face of the holder as a machine bed bearing face, means throughwhich uniform length in a series of punch blanks may be maintained inaccordance with selected predetermined lengths of an initially heldblank including a clearance slot intermediate the faces of the holderhaving sides perpendicular to the axis of the blank, and means forguiding a drill or the like through a blank retained in said holderincluding an opening intersecting said clearance slot and a face of saidholder remote therefrom.

7. A holder for grinding punch blanks and the 'ke comprising a body ofpolyangular form,

means adapted to centralize the shank of a punch therein comprising aV-shaped slot cut lengthwise of the holder, clamping means whoseexternal limits permit the use of any face of the holder as a machinebed bearing face, and means for rendering a portion of the blankdisposed internally of the faces of the holder accessible to a workingoperation comprising a slot intersecting faces of said holder remotefrom said V- shape slot.

8. A holder for grinding punch blanks and the like comprising a body ofpolyangular form, means adapted to centralize the shank of a punchtherein comprising a V-shaped slot cut lengthwise of the holder,clamping means whose external limits permit the use of any face of theholder as a machine bed bearing face, means for rendering a portion ofthe blank disposed internally of the faces of the holder accessible to aworking operation comprising a slot intersecting said V-shaped slot andfaces of said holder remote from said V-shaped slot, and means forguiding a drill or the like through work supported in said V-shaped slotincluding an opening intersecting said slots and a face remote from saidslots.

FLOYD E. JOHNSON.

